As females me and my friends used to this a lot, mostly in pairs, but also did it alone sometimes during daylight. I rarely see anyone hitching now, not even in the usual places where there would quite a few and we wished each other luck!
Our parents didn't really know, well sometimes, but not much they could do about it until we reached our destination and rang from a pay phone to say we were safe. Looking back I of course realise how awful this was for them but for me it was just exciting while travelling across many different countries.
Now, even with the protection of mobile phones and trackers, I would be apprehensive of my DC did this and with online everything we book and pay for tickets for them. In the 1980s/90s they may well have given you the money but you decided to hitch and spend it on ither things!
So, any old hitchers out there who would like to share? I know many did as means to get from A to B after work, not always a lifestyle choice. Xx